build on OS X

[jon-daemon]

I'm trying to build it on OS X High Sierra 10.13.6.
I use a UNI-T UT61E which is not supported with a custom serial to USB adapter. It can connect with official qtdmm 0.8.12 and show correct numbers but not decoding correctly. For example it shows 04898 when the multimeter reads 4.898V. (I connect it at 19200 7-O-1).
I found another qtdmm port here that is compatible with my multimeter but I cannot build it on OS X. Also there are many differences in the code to use a USB HID device instead of a serial adapter so I was thinking to keep only the decoding part from that user.
I built your code on OS X but it's not working as expected. It takes longer to connect to my multimeter and shows the same data with 0.8.12 version but it's not refreshing the data (might refresh once after a long time). I added the function for the UT61E decoding from the other user and it has the same issue. Connects after a while, shows correct data, but doesn't refresh.

What could be the issue? I know it's an old project but I'd really like to build it and share the code once it's 100% functional.